Add initialization to log timer event guid.
Add initialization to log timer event guid.

Review URL: http://codereview.appspot.com/2167044

git-svn-id: db59699583a60be9a535cd09cdc9132301867226@103 15e8cca8-e42c-11de-a347-f34a4f72eb7d

sebmarchand/syzygy,wangming28/syzygy,wangming28/syzygy,pombreda/syzygy,ericmckean/syzygy,google/syzygy,Eloston/syzygy,pombreda/syzygy,google/syzygy,google/syzygy,supriyantomaftuh/syzygy,pombreda/syzygy,google/syzygy,sebmarchand/syzygy,supriyantomaftuh/syzygy,sebmarchand/syzygy,ericmckean/syzygy,sebmarchand/syzygy,ericmckean/syzygy,ericmckean/syzygy,wangming28/syzygy,sebmarchand/syzygy,pombreda/syzygy,Eloston/syzygy,ericmckean/syzygy,pombreda/syzygy,wangming28/syzygy,supriyantomaftuh/syzygy,supriyantomaftuh/syzygy